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          <i class="fa fa-codepen fa-lg"></i> Edit
        </a>
        <div class="span12">
          <h4 id="title">Icon Sprites with WebGL</h4>
          <p class="tags">
            <span class="badge-group">
              <a
                href="./index.html?q=webgl" class="badge badge-info">webgl</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="webgl"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-stretch.html&quot;&gt;Band Contrast Stretch&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-style.html&quot;&gt;Change Tile Layer Style&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./heatmap-earthquakes.html&quot;&gt;Earthquakes Heatmap&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./icon-sprite-webgl.html&quot;&gt;Icon Sprites with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-layer-swipe.html&quot;&gt;Layer Swipe (WebGL)&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./numpytile.html&quot;&gt;Rendering 16-bit NumpyTiles&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-sea-level.html&quot;&gt;Sea Level (with WebGL)&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-shaded-relief.html&quot;&gt;Shaded Relief (with WebGL)&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-tile-style.html&quot;&gt;WebGL Tile Layer Styles&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-tiles.html&quot;&gt;WebGL Tiles&lt;/a&gt;"
                tabindex="0"
                >12</a>
            </span>
            <span class="badge-group">
              <a
                href="./index.html?q=icon" class="badge badge-info">icon</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="icon"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./animated-gif.html&quot;&gt;Animated GIF&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-color.html&quot;&gt;Icon Colors&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./modify-icon.html&quot;&gt;Icon modification&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-negative.html&quot;&gt;Icon Pixel Operations&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-scale.html&quot;&gt;Icon Scale&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./icon-sprite-webgl.html&quot;&gt;Icon Sprites with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon.html&quot;&gt;Icon Symbolizer&lt;/a&gt;"
                tabindex="0"
                >8</a>
            </span>
            <span class="badge-group">
              <a
                href="./index.html?q=sprite" class="badge badge-info">sprite</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="sprite"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./icon-sprite-webgl.html&quot;&gt;Icon Sprites with WebGL&lt;/a&gt;"
                tabindex="0"
                >2</a>
            </span>
            <span class="badge-group">
              <a
                href="./index.html?q=point" class="badge badge-info">point</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="point"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./icon-sprite-webgl.html&quot;&gt;Icon Sprites with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;"
                tabindex="0"
                >2</a>
            </span>
            <span class="badge-group">
              <a
                href="./index.html?q=ufo" class="badge badge-info">ufo</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="ufo"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./icon-sprite-webgl.html&quot;&gt;Icon Sprites with WebGL&lt;/a&gt;"
                tabindex="0"
                >1</a>
            </span>
          </p>
          <div class="modal modal-tag-example" id="tag-example-list" tabindex="-1" role="dialog" aria-labelledby="tag-example-title" aria-hidden="true">
            <div class="modal-dialog modal-dialog-scrollable" role="document">
              <div class="modal-content">
                <div class="modal-header">
                  <h5 class="modal-title" id="tag-example-title"></h5>
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                    <span aria-hidden="true">&times;</span>
                  </button>
                </div>
                <div class="modal-body">
                  <div class="list-group"></div>
                </div>
              </div>
            </div>
          </div>
          <div id="map" class="map"></div>
<div>Current sighting: <span id="info"></span></div>
<div>
  <label for="shape-filter">Filter by UFO shape:</label>
  <select id="shape-filter"></select>
</div>

        </div>
        <form method="POST" id="codepen-form" target="_blank" action="https://codesandbox.io/api/v1/sandboxes/define">
          <input id="codesandbox-params" type="hidden" name="parameters">
        </form>
      </div>

      <div class="row-fluid">
        <div class="span12">
          <p id="shortdesc">Rendering many icons with WebGL</p>
          <div id="docs"><p>This example shows how to use <code>ol/layer/WebGLPoints</code> to render
  a very large amount of sprites. The above map is based on a dataset from the National UFO Reporting Center: each
  icon marks a UFO sighting according to its reported shape (disk, light, fireball...). The older the sighting, the redder
  the icon.</p>
<p>A very simple sprite atlas is used in the form of a PNG file containing all icons on a grid. Then, the <code>style</code> object
  given to the <code>ol/layer/WebGLPoints</code> constructor is used to specify which sprite to use according to the sighting shape.</p>
<p>The dataset contains around 80k points and can be found here: <a href="https://www.kaggle.com/NUFORC/ufo-sightings">https://www.kaggle.com/NUFORC/ufo-sightings</a></p>
</div>
        </div>
      </div>

      <div class="row-fluid">
        <h5 class="source-heading">main.js</h5>
        <pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
import Feature from &#x27;ol/Feature&#x27;;
import Map from &#x27;ol/Map&#x27;;
import Point from &#x27;ol/geom/Point&#x27;;
import TileLayer from &#x27;ol/layer/Tile&#x27;;
import View from &#x27;ol/View&#x27;;
import WebGLPointsLayer from &#x27;ol/layer/WebGLPoints&#x27;;
import XYZ from &#x27;ol/source/XYZ&#x27;;
import {Vector} from &#x27;ol/source&#x27;;
import {fromLonLat} from &#x27;ol/proj&#x27;;

const key &#x3D; &#x27;Get your own API key at https://www.maptiler.com/cloud/&#x27;;
const attributions &#x3D;
  &#x27;&lt;a href&#x3D;&quot;https://www.maptiler.com/copyright/&quot; target&#x3D;&quot;_blank&quot;&gt;&amp;copy; MapTiler&lt;/a&gt; &#x27; +
  &#x27;&lt;a href&#x3D;&quot;https://www.openstreetmap.org/copyright&quot; target&#x3D;&quot;_blank&quot;&gt;&amp;copy; OpenStreetMap contributors&lt;/a&gt;&#x27;;

const map &#x3D; new Map({
  layers: [
    new TileLayer({
      source: new XYZ({
        attributions: attributions,
        url:
          &#x27;https://api.maptiler.com/tiles/satellite/{z}/{x}/{y}.jpg?key&#x3D;&#x27; + key,
        tileSize: 512,
      }),
    }),
  ],
  target: document.getElementById(&#x27;map&#x27;),
  view: new View({
    center: [0, 4000000],
    zoom: 2,
  }),
});

const vectorSource &#x3D; new Vector({
  features: [],
  attributions: &#x27;National UFO Reporting Center&#x27;,
});

const oldColor &#x3D; [255, 160, 110];
const newColor &#x3D; [180, 255, 200];
const size &#x3D; 16;

const style &#x3D; {
  variables: {
    filterShape: &#x27;all&#x27;,
  },
  filter: [
    &#x27;case&#x27;,
    [&#x27;!&#x3D;&#x27;, [&#x27;var&#x27;, &#x27;filterShape&#x27;], &#x27;all&#x27;],
    [&#x27;&#x3D;&#x3D;&#x27;, [&#x27;get&#x27;, &#x27;shape&#x27;], [&#x27;var&#x27;, &#x27;filterShape&#x27;]],
    true,
  ],
  symbol: {
    symbolType: &#x27;image&#x27;,
    src: &#x27;data/ufo_shapes.png&#x27;,
    size: size,
    color: [
      &#x27;interpolate&#x27;,
      [&#x27;linear&#x27;],
      [&#x27;get&#x27;, &#x27;year&#x27;],
      1950,
      oldColor,
      2013,
      newColor,
    ],
    rotateWithView: false,
    offset: [0, 0],
    textureCoord: [
      &#x27;match&#x27;,
      [&#x27;get&#x27;, &#x27;shape&#x27;],
      &#x27;light&#x27;,
      [0, 0, 0.25, 0.5],
      &#x27;sphere&#x27;,
      [0.25, 0, 0.5, 0.5],
      &#x27;circle&#x27;,
      [0.25, 0, 0.5, 0.5],
      &#x27;disc&#x27;,
      [0.5, 0, 0.75, 0.5],
      &#x27;oval&#x27;,
      [0.5, 0, 0.75, 0.5],
      &#x27;triangle&#x27;,
      [0.75, 0, 1, 0.5],
      &#x27;fireball&#x27;,
      [0, 0.5, 0.25, 1],
      [0.75, 0.5, 1, 1],
    ],
  },
};

// key is shape name, value is sightings count
const shapeTypes &#x3D; {
  all: 0,
};
const shapeSelect &#x3D; document.getElementById(&#x27;shape-filter&#x27;);
shapeSelect.addEventListener(&#x27;input&#x27;, function () {
  style.variables.filterShape &#x3D;
    shapeSelect.options[shapeSelect.selectedIndex].value;
  map.render();
});
function fillShapeSelect() {
  Object.keys(shapeTypes)
    .sort(function (a, b) {
      return shapeTypes[b] - shapeTypes[a];
    })
    .forEach(function (shape) {
      const option &#x3D; document.createElement(&#x27;option&#x27;);
      option.text &#x3D; &#x60;${shape} (${shapeTypes[shape]} sightings)&#x60;;
      option.value &#x3D; shape;
      shapeSelect.appendChild(option);
    });
}

const client &#x3D; new XMLHttpRequest();
client.open(&#x27;GET&#x27;, &#x27;data/csv/ufo_sighting_data.csv&#x27;);
client.onload &#x3D; function () {
  const csv &#x3D; client.responseText;
  const features &#x3D; [];

  let prevIndex &#x3D; csv.indexOf(&#x27;\n&#x27;) + 1; // scan past the header line

  let curIndex;
  while ((curIndex &#x3D; csv.indexOf(&#x27;\n&#x27;, prevIndex)) !&#x3D; -1) {
    const line &#x3D; csv.substr(prevIndex, curIndex - prevIndex).split(&#x27;,&#x27;);
    prevIndex &#x3D; curIndex + 1;

    const coords &#x3D; fromLonLat([parseFloat(line[5]), parseFloat(line[4])]);

    // only keep valid points
    if (isNaN(coords[0]) || isNaN(coords[1])) {
      continue;
    }

    const shape &#x3D; line[2];
    shapeTypes[shape] &#x3D; (shapeTypes[shape] ? shapeTypes[shape] : 0) + 1;
    shapeTypes[&#x27;all&#x27;]++;

    features.push(
      new Feature({
        datetime: line[0],
        year: parseInt(/[0-9]{4}/.exec(line[0])[0]), // extract the year as int
        shape: shape,
        duration: line[3],
        geometry: new Point(coords),
      })
    );
  }
  vectorSource.addFeatures(features);
  fillShapeSelect();
};
client.send();

map.addLayer(
  new WebGLPointsLayer({
    source: vectorSource,
    style: style,
  })
);

const info &#x3D; document.getElementById(&#x27;info&#x27;);
map.on(&#x27;pointermove&#x27;, function (evt) {
  if (map.getView().getInteracting() || map.getView().getAnimating()) {
    return;
  }
  const pixel &#x3D; evt.pixel;
  info.innerText &#x3D; &#x27;&#x27;;
  map.forEachFeatureAtPixel(pixel, function (feature) {
    const datetime &#x3D; feature.get(&#x27;datetime&#x27;);
    const duration &#x3D; feature.get(&#x27;duration&#x27;);
    const shape &#x3D; feature.get(&#x27;shape&#x27;);
    info.innerText &#x3D;
      &#x27;On &#x27; +
      datetime +
      &#x27;, lasted &#x27; +
      duration +
      &#x27; seconds and had a &quot;&#x27; +
      shape +
      &#x27;&quot; shape.&#x27;;
  });
});
</code></pre>
      </div>

      <div class="row-fluid">
        <h5 class="source-heading">index.html</h5>
        <pre><code id="example-html-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
  &lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;Icon Sprites with WebGL&lt;/title&gt;
    &lt;!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer --&gt;
    &lt;script src="https://unpkg.com/elm-pep@1.0.6/dist/elm-pep.js"&gt;&lt;/script&gt;
    &lt;!-- The lines below are only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"&gt;&lt;/script&gt;
    &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"&gt;&lt;/script&gt;
    &lt;style&gt;
      .map {
        width: 100%;
        height:400px;
      }
    &lt;/style&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;div&gt;Current sighting: &lt;span id&#x3D;&quot;info&quot;&gt;&lt;/span&gt;&lt;/div&gt;
    &lt;div&gt;
      &lt;label for&#x3D;&quot;shape-filter&quot;&gt;Filter by UFO shape:&lt;/label&gt;
      &lt;select id&#x3D;&quot;shape-filter&quot;&gt;&lt;/select&gt;
    &lt;/div&gt;
    &lt;script src="main.js"&gt;&lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
      </div>

      <div class="row-fluid">
        <h5 class="source-heading">package.json</h5>
        <pre><code id="example-pkg-source" class="language-json">{
  &quot;name&quot;: &quot;icon-sprite-webgl&quot;,
  &quot;dependencies&quot;: {
    &quot;ol&quot;: &quot;6.13.0&quot;
  },
  &quot;devDependencies&quot;: {
    &quot;parcel&quot;: &quot;^2.0.0&quot;
  },
  &quot;scripts&quot;: {
    &quot;start&quot;: &quot;parcel index.html&quot;,
    &quot;build&quot;: &quot;parcel build --public-url . index.html&quot;
  }
}</code></pre>
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